// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_APP_LIST_SEARCH_CONTROLLER_H_
#define UI_APP_LIST_SEARCH_CONTROLLER_H_

#include <stddef.h>

#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "base/timer/timer.h"
#include "ui/app_list/app_list_export.h"
#include "ui/app_list/app_list_model.h"
#include "ui/app_list/search/mixer.h"
#include "ui/app_list/speech_ui_model_observer.h"

namespace app_list {

class History;
class SearchBoxModel;
class SearchProvider;
class SearchResult;

// Controller that collects query from given SearchBoxModel, dispatches it
// to all search providers, then invokes the mixer to mix and to publish the
// results to the given SearchResults UI model.
class APP_LIST_EXPORT SearchController {
public:
    SearchController(SearchBoxModel* search_box,
        AppListModel::SearchResults* results,
        History* history);
    virtual ~SearchController();

    void Start(bool is_voice_query);
    void Stop();

    void OpenResult(SearchResult* result, int event_flags);
    void InvokeResultAction(SearchResult* result,
        int action_index,
        int event_flags);

    // Adds a new mixer group. See Mixer::AddGroup.
    size_t AddGroup(size_t max_results, double boost, double multiplier);

    // Adds a new mixer group. See Mixer::AddOmniboxGroup.
    size_t AddOmniboxGroup(size_t max_results, double boost, double multiplier);

    // Takes ownership of |provider| and associates it with given mixer group.
    void AddProvider(size_t group_id, scoped_ptr<SearchProvider> provider);

private:
    typedef ScopedVector<SearchProvider> Providers;

    // Invoked when the search results are changed.
    void OnResultsChanged();

    SearchBoxModel* search_box_;

    bool dispatching_query_;
    Providers providers_;
    scoped_ptr<Mixer> mixer_;
    History* history_; // KeyedService, not owned.

    bool is_voice_query_;

    base::OneShotTimer stop_timer_;

    DISALLOW_COPY_AND_ASSIGN(SearchController);
};

} // namespace app_list

#endif // UI_APP_LIST_SEARCH_CONTROLLER_H_
